Food intolerances usually occur because

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Food intolerances usually occur because the person's small intestine does not produce enough of a digestive enzyme needed to break down the offending food. This results in difficulties digesting certain foods, leading to symptoms such as bloating, gas, and diarrhea. Examples include lactose intolerance, where the digestive enzyme lactase is not produced in sufficient quantities to break down the milk sugar lactose, and fructose intolerance, where the enzyme needed to break down fructose is lacking.

Food Intolerances Usually Occur Because